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Beijing has deployed its coast guard into the maritime area of the Diaoyu islands and military drones past remote Japanese territory as China escalates strains over the Japan's leader's remarks regarding the island of Taiwan.

Patrol Operations

This past Sunday, the China's maritime patrol announced that its vessels carried out a “lawful patrol operation” through the waters of the Diaoyu islands, which are administered by Japan but also claimed by Beijing.

“Chinese maritime patrol unit 1307 performed surveillance within the maritime jurisdiction of the Diaoyu islands. This was a legitimate rights enforcement activity undertaken by the Chinese maritime authorities to uphold its rights and interests,” the statement said.

Diplomatic Spat

Beijing and Tokyo have consistently clashed around the islands but the recent developments come amid an intensifying diplomatic spat after the Japan's leader, the Japanese official, addressed lawmakers that if China attack democratically ruled Taiwan it might provoke a military response from Tokyo.

That provoked a furious reaction from China, which has indicated it demands a retraction from the Japanese official.

Island's Stance

China claims Taiwan as its sovereign land and intends to annex it under what it terms “reunification”. It has left open the military option. The island's administration and citizens categorically refuse the idea of Beijing's control – preferring to maintain the status quo without explicitly declaring themselves independent, but vowing to defend themselves if required.

An military assault by China would risk escalating into a international confrontation, possibly drawing in the United States and other allies including Japan, which has territory just 110km (68 miles) from Taiwan.

Defense Operations

On the island, the military authorities reported this weekend that it had detected three dozen PLA planes, multiple naval vessels and one “official” ship, which was likely the maritime patrol, operating around the territory over the past 24 hours.

Maps provided by the ministry showed up to multiple UAVs operating near Taiwan and the Japan's territory off its northeastern shoreline, appearing to go unusually near to Yonaguni. Chinese military transits there are not rare, but uncommon, and Chinese military activity in Taiwan’s air defence identification zone generally has been minimal in the past month.

Earlier this weekend, the defense officials said Beijing had been conducting another “joint combat patrol” to “test our defensive capabilities”. It noted Taiwan had dispatched military assets to track the developments. Taiwan reports such Chinese patrols a few times monthly as part of what Taipei says is an continuous strategic pressure.

Diplomatic Pressure

Japan has been facing mounting pressure from Beijing since Takaichi made her comments, with Beijing's diplomatic representative in Osaka triggering an official complaint from Tokyo by commenting that “the dirty head that sticks itself out must be cut off”.

China then called in Japan's diplomat for the first time in more than two years, and Beijing's military authorities declared that any Japanese intervention would be doomed to fail.

Travel and Education Advisory

On Friday, Beijing advised its people to avoid visiting Japan, leading Japan to request China to take “suitable actions”, though it provided no details.

Three Chinese airlines said on Saturday that flights to Tokyo could be refunded or changed for free.

Adding to the tensions, Beijing's administration on the weekend advised students to rethink education plans in Japan, citing what it characterized as an unstable security environment.

Although not an outright prohibition, a dramatic reduction in the population of learners from China could have a negative impact on academic institutions in Japan. A historic high of over 336,000 international students were studying in Japan last year, according to official data. They featured over 123,000 learners from China – by far the largest demographic.

Media Response

Earlier this weekend, a official press commentary accused Takaichi of staging a political stunt that was “both reckless and fundamentally flawed”.

“A clash between Tokyo and Beijing would not be a small-scale encounter; it would likely draw in other nations, including the United States, and could rapidly escalate to a major confrontation with unimaginable consequences.”

Strategic Positions

The government of Taiwan says only its people can decide its future. Japanese leaders have previously avoided publicly mentioning Taiwan when discussing such scenarios, maintaining a “strategic ambiguity” also preferred by Tokyo’s main security ally, the US.

However, China’s ruling Communist party says the unification of Taiwan with the mainland China is “inevitable”, and portrays dissent as provocative. As it advances toward potential armed takeover, China has also been escalating its non-military activity and its rhetoric towards the island.